KR102540710B1 - Air and slurry discharge device of large-scale DCM agitator - Google Patents

Abstract

The present invention relates to an air and slurry discharge apparatus for a large-scale DCM agitator. In a large-scale DCM agitator, the air and slurry automatic opening/closing apparatus comprises: an air spray pipe connected to an air supply pipe at right angles, and extended to an end of an outlet; an air nozzle inserted into the air spray pipe with an air passage, and moving forward by the pressure of air when air is supplied to open an air outlet, and moving backward by a compression force of a first spring on an inner side end when air is not supplied to block an air outlet; and an opening/closing hole slidably installed on the outer circumferential surface on the air outlet side of the air spray pipe, and blocking a slurry outlet when slurry is not supplied by compression force of a second spring connected by being inserted into an outer surface of the air spray pipe, and snapping the second spring when slurry is supplied to open the slurry outlet. Therefore, slurry injection effects can be improved.

Description

Air and slurry discharge device of large-scale DCM agitator}

The present invention relates to an air and slurry discharge device of a large-sided DCM agitator, and more particularly, slurry injected into the ground is improved through high-pressure compressed air to form a large-sided soil reformer by a deep mixing treatment method By uniformly injecting and spraying the entire area to increase the agitation effect with the soil, the quality of the large-sided soil reformer is improved, and a backflow prevention device is installed at the discharge port to prevent soil and slurry from flowing back into the excavation agitation rod. It relates to an air and slurry discharge device of a large-sided DCM agitator.

In general, soft ground made of soil such as clay or silt has a high groundwater level, is saturated, and has low bearing capacity, causing great problems in stability and settlement of structures, etc. Therefore, physical or chemical soft ground improvement methods are used to improve it. do.

Deep cement mixing method, called DCM (Deep Cement Mixing) method, is one of the methods for improving the soft ground as described above. It improves soft ground by chemically solidifying it by stirring and mixing while injecting into the ground such as gravel layer or weathered soil with upper and lower discharge method and constant pressure. In particular, it is physically and chemically A ground improvement body in the form of a solidified pile is constructed, and the soft ground is strengthened by the ground improvement body as described above.

Such an in-depth mixing treatment method is usually performed using an in-depth mixing treatment equipment having a rod, a stirring blade for agitating the underground soil and solidified material, and a means for injecting the solidified material through the inside of the rod.

In the deep mixing treatment method using the deep mixing treatment equipment described above, the rod is penetrated into the ground using an excavation means attached to the tip of the rod and the rod penetrated to the design depth is pulled out again. The solidification material is injected into the ground, and mixing and agitation of the soil sand and the solidification material is performed using a stirring blade.

Therefore, it can be said that the quality of the constructed soil reformer varies greatly depending on how uniformly the solidified material injected into the ground is mixed and stirred with soil over the entire range.

In addition, the scale of the underground reformer should be set to a cross section that can sufficiently withstand external loads such as its own weight and the load on the upper part that will act on it, earth pressure, and water pressure. And because the effect of increasing economic feasibility is large, in recent years, medium-to-large cross section DCM of D1000mm∼1300mm has been reflected in numerous field designs, and the demand for large cross section DCM of D1600mm or more is increasing.

However, in the case of the large-sided DCM that forms a large-sided soil reformer, the injection passage for supplying the slurry becomes relatively large, so the spraying pressure of the slurry supplied together with drilling water and compressed air is low, so that the slurry is uniform between the soil particles. There is a problem that the agitation effect is low because it does not penetrate properly.

In addition, since the outlet through which the air and slurry are discharged is open, the slurry or compressed air injected into the ground flows back into the rod, reducing the injection effect and clogging the outlet.

Patent No. 10-0797845 in which a rubber packing film is attached to the discharge port to solve the backflow problem is disclosed, but this structure has a disadvantage in reducing the slurry discharge speed and injection.

<Prior art literature>

Registered Patent No. 10-2345231, 2021. 12. 29 Notice

Registered Patent No. 10-0797845, 2008. 01. 24. Notice

An object of the present invention is to solve the conventional problems, by simultaneously injecting the slurry with air with increased spray pressure in one stroke so that the slurry is uniformly distributed over the entire improved area, and the air sprayed with strong pressure (compressed air) It is an object of the present invention to provide an air and slurry discharge device of a large surface DCM agitator that enables large surface DCM construction by increasing the agitation efficiency of slurry by increasing the fluidity of soil particles by air).

Another object of the present invention is to provide an air and slurry discharge device of a large-faced DCM agitator that facilitates the injection of air and slurry by minimizing clogging of the discharge port by installing a backflow prevention device at the discharge port.

According to the most preferred embodiment of the present invention for solving the above problems, a plurality of stirring blades interlockingly installed on the outer circumference of the excavation rod;
A slurry supply pipe installed inside the excavation rod to inject slurry;
an air supply pipe separately installed from the slurry supply pipe;
a slurry outlet for discharging the slurry and air supplied to the slurry supply pipe and the air supply pipe; and,
Inside the slurry outlet, when air and slurry are supplied, the air outlet and the slurry outlet are opened, and when air and slurry are not supplied, the air outlet and the slurry outlet are automatically closed to prevent clogging and reverse flow. Air and slurry automatic opening and closing In the single-sided DCM agitator with the device installed,
The air and slurry automatic opening and closing device includes an air injection pipe connected perpendicularly to the air supply pipe and extending to the end of the discharge port;
It is inserted with an air passage inside the air injection pipe and moves forward with air pressure when air is supplied to open the air outlet, and when air is not supplied, it is retreated by the compressive force of the first spring at the inner end to block the air outlet air nozzle; And it is slidably installed on the outer circumferential surface of the air outlet side of the air injection pipe, and blocks the slurry outlet when the slurry is not supplied by the compressive force of the second spring connected to the outer surface of the air injection pipe, and when the slurry is supplied, There is provided an air and slurry discharge device of a large-sided DCM agitator, characterized in that it comprises a; opening and closing opening for opening the slurry discharge port while elastically springing 2 springs.

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According to the present invention, the fluidity of the soil particles is increased by the high-pressure compressed air supplied together with the slurry, so that the soil in the agitation area rises smoothly to reduce the displacement of the surroundings, thereby lowering the load on the auger and moving the slurry between the soil particles. Infiltration is made smooth to increase the agitation effect and improve the quality of the soil reformer, which not only enables large-area DCM construction, but also has the advantage of using existing devices and facilities for large-area DCM construction. .

In addition, in the present invention, a backflow prevention device having an automatic air opening and closing function is installed at the discharge port to minimize clogging of the discharge port and prevent backflow, thereby improving the injection effect of the slurry.

1 is a partial cross-sectional view of a multi-axis excavation rod according to an embodiment of the present invention;
Figure 2 is a partial enlarged cross-sectional view of the excavation rod
Figure 3 is an enlarged cross-sectional view of the discharge port
Figure 4 is an enlarged cross-sectional view of a state in which the slurry outlet and the air outlet are blocked
5 is an enlarged cross-sectional view of a state in which a slurry outlet and an air outlet are opened;
6 is a view of another embodiment in which the slurry discharge port is vertically installed at the lower part of the stirring blade
Figure 7 is an enlarged cross-sectional view of the slurry outlet of Figure 6

Hereinafter, the most preferred embodiment of the present invention will be described in detail, focusing on parts necessary for understanding the operation and operation according to the present invention with reference to the accompanying drawings.

While describing the embodiments of the present invention, descriptions of unnecessary technical details that are well known in the technical field to which the present invention pertains and are not directly related to the present invention are omitted for clearer delivery without obscuring the gist of the present invention.

In addition, in the present invention, air as a comprehensive expression means compressed air.

1 is a partial cross-sectional view of a multiaxial excavation rod according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a partial excavation rod, FIG. 3 is an enlarged cross-sectional view of a discharge port, and FIG. 4 is a slurry discharge port and an air injection port An enlarged cross-sectional view of a blocked state, Figure 5 is an enlarged cross-sectional view of a state in which the slurry discharge port and the air injection port are open, Figure 6 is another embodiment of a state in which the slurry discharge port is vertically installed at the bottom of the stirring blade, Figure 7 is a diagram 6 is an enlarged cross-sectional view of the slurry outlet.

The air and slurry discharge device of the large-sided DCM agitator of the present invention improves the structure of the slurry discharge port and simultaneously discharges the slurry and compressed air from each line, but sprays the slurry at a stronger pressure by the compressed air to achieve excellent agitation. It is characterized in that it is possible to construct a high-strength large-sided underground reformer.

Another feature of the present invention is that a backflow prevention device is installed at the slurry discharge port so that the slurry, sand and air do not flow backward.

1 shows a multi-axis excavation rod 100 to which the present invention is applied, and the excavation rod 100 to which a plurality of stirring blades 101 are interlocked is connected to the lowermost part of the rod unit of the deep mixing processing equipment and is installed in the underground A slurry outlet 120 connected to the slurry supply pipe 110 is installed so that the slurry can be injected during excavation or extraction, and the slurry outlet 120 has a smaller diameter air supply pipe 130 separately installed outside the slurry supply pipe 110 ) is installed internally.

In one embodiment of the present invention shown in FIGS. 2 to 5, the slurry discharge port 120 is installed horizontally along the circumferential direction of the excavation rod 100 so as to cross the vertical slurry supply pipe 110, so that the slurry is discharged in a substantially horizontal direction As an example of a structure for spraying, the slurry outlet 120 has the same diameter as the slurry supply pipe 110 on the side connected to the slurry supply pipe 110, and the opposite outlet is a concentric reducer 200 having a narrower diameter. It is configured and installed to penetrate the drilling rod 100.

As such, the slurry outlet 120 composed of the concentric reducer 200 functions to discharge the slurry at a stronger pressure through an outlet having a smaller diameter than the slurry supply pipe 110.

Here, the size of the outlet of the concentric reducer 200 is preferably about half the diameter of the inlet, but is not necessarily limited thereto.

On the other hand, the air and slurry automatic opening and closing device 300 is installed in the air supply pipe 130 installed inside the slurry outlet 120.

The air and slurry automatic opening and closing device 300 includes an air injection pipe 310 connected orthogonally to the air supply pipe 130 and extending to the end of the slurry outlet 120, and air inside the air injection pipe 310 It is inserted through the passage 311 and advances with the pressure of the compressed air when compressed air is supplied to open the air outlet 312 and retreats with the compressive force of the first spring 313 at the inner end when the compressed air is not supplied. and an air nozzle 314 blocking the air outlet 312.

Here, the air outlet 312 of the air injection pipe 310 has a first tapered surface 315 extending from the inside to the outside, and the front end of the air nozzle 314 has a first tapered surface 315 A second tapered surface 316 corresponding to is formed so that when the air outlet 312 is blocked, the first tapered surface 315 and the second tapered surface 316 come into close contact to increase the blocking effect.

In addition, an opening and closing opening 400 for opening and blocking the discharge port is slidably installed on the outer circumferential surface of the air outlet 312 side of the air injection pipe 310, and the second spring 410 is fitted and connected to the outer surface of the air injection pipe 310. ) When the slurry is supplied, the slurry outlet 120 is opened by sliding the opening and closing port 400 while the second spring 410 is retracted, and when the slurry is not supplied, the second spring 410 retreats with the return force to block the slurry outlet 120.

That is, in the automatic air and slurry opening and closing device 300, an opening and closing device for opening and closing the air outlet 312 and the slurry outlet 120 is installed at the same time, and the compressed air and slurry supplied during the excavation work are discharged through the air outlet ( 312) and the slurry outlet 120 are opened at the same time to inject into the ground, and when the excavation work is not performed, the air outlet 312 and the slurry outlet 120 are automatically blocked at the same time to prevent reverse flow and prevent clogging at the same time. .

6 and 7 show the slurry supply pipe 110 as another embodiment of the present invention applied to a structure in which the slurry outlet 120 is vertically installed at the bottom of the stirring blade 101 to spray the slurry vertically toward the ground On the outlet side of the connected concentric reducers 200, a L-shaped discharge pipe 500 having the same diameter is connected and installed so as to extend into the stirring blades 101, and the discharge pipe 500 facing the ground The air and slurry automatic opening and closing device 300 connected to the air supply pipe 130 is installed inside the vertical part of the.

Therefore, the slurry and air are simultaneously discharged in a vertical direction toward the ground through the air outlet 312 and the slurry outlet 120 by the air and slurry automatic opening and closing device 300 installed in the vertical portion via the discharge pipe 500, The soil and sand are stirred, and when the slurry and compressed air are not supplied, the air outlet 312 and the slurry outlet 120 are blocked to prevent reverse flow.

This structure connects the discharge pipe 500 to the concentric reducer 200 of the slurry outlet 120 to install the slurry outlet 120 on the agitator blade 101, and leads to the inside of the agitator blade 101. The automatic air and slurry opening and closing device 300 is installed on the vertical part to discharge the slurry and compressed air in the vertical direction. Since the automatic opening and closing operation of the air and slurry is the same as that of the above embodiment, a detailed description thereof will be omitted.

The operation of the automatic air and slurry opening and closing device 300 according to the present invention will be described in more detail.

As shown in FIGS. 3 to 5, the slurry outlet 120 through which the slurry and air are discharged is opened and closed by an automatic air and slurry opening and closing device installed close to the inside thereof. Since the air passage 311 is placed inside the air injection pipe 310 connected to and the air nozzle 314 is inserted, the compressed air supplied from the air supply pipe 130 is supplied from the air nozzle 310 inside the air injection pipe 310. Discharge is performed through an air passage 311 formed between the air passage 314 and the air passage 311 . However, since the air nozzle 314 is pulled back by the compressive force of the first spring 313 installed at the inner end and the front end blocks the air outlet 312 of the air injection pipe 310 in a retracted state, when compressed air is not supplied While the air outlet 312 is not opened, when compressed air is supplied from the air supply pipe 130, the air nozzle 314 advances while overcoming the compressive force of the first spring 313 by the pressure of the compressed air, As the outlet 312 is opened, compressed air is sprayed.

Here, the air outlet 312 at the front end of the air injection pipe 310 has a first tapered surface 315 extending from the inside to the outside, and the front end of the air nozzle 314 corresponds to the first taper surface 315. Since the second tapered surface 316 is formed, when the air outlet 312 is blocked, the first tapered surface 315 and the second tapered surface 316 are closely attached to each other to more reliably block the air outlet 312. As a result, the problem of inflow of foreign substances from the outside does not occur.

In addition, since the opening and closing opening 400 for opening and closing the outlet through which the slurry is discharged is pulled by the compressive force of the second spring 410 installed outside the air injection pipe 310, the outlet also opens and closes the outlet 400 when the slurry is not supplied. ), and when the slurry is supplied, the opening and closing port 400 advances with the pressure of the slurry to open the slurry outlet 120, so that the slurry passes through the slurry outlet 120 in a substantially horizontal direction to the underground improvement area When the supply of the slurry is stopped, the pressure of the slurry is not applied, so the opening and closing hole 400 is retracted by the compressive force of the second spring 410 to block the slurry outlet 120, thereby preventing clogging of the outlet and soil sand and slurry prevents backflow of

On the other hand, the supply of compressed air and slurry is performed simultaneously in one stroke. When the slurry is injected, the slurry is sprayed under strong pressure by high-pressure compressed air, so it is evenly injected throughout the improvement area of the ground and agitation with soil The effect is increased, and in particular, compressed air increases the fluidity of soil particles and softens the ground, so the displacement of the surroundings becomes small, which lowers the load on the auger, enabling large-area DCM construction as existing devices and equipment.

In addition, since the automatic air and slurry opening and closing device 300 of the present invention is made of a metal material that has excellent durability and does not rust, it is not easily damaged when working in the ground, has fewer malfunctions, and has a long lifespan.

In the above, one embodiment of the present invention has been described, but those skilled in the art can add, change, delete, or add elements within the scope not departing from the spirit of the present invention described in the claims. Various modifications and changes may be made to the present invention by addition or the like, which will also be included within the scope of the present invention.

Reference Numerals 100: excavation rod 101: stirring blade 110: slurry supply pipe 120: slurry outlet 130: air supply pipe 200: concentric reducer 300: air and slurry automatic opening and closing device 310: air injection pipe 311: air passage 312: air outlet 313: first Spring 314: Air nozzle 315: First taper surface 316: Second taper surface 400: Opening and closing
410: second spring 500: discharge pipe

Claims (4)

A plurality of stirring blades interlockingly installed on the outer circumference of the excavation rod;
A slurry supply pipe installed inside the excavation rod to inject slurry;
an air supply pipe separately installed from the slurry supply pipe;
a slurry outlet for discharging the slurry and air supplied to the slurry supply pipe and the air supply pipe; and,
Inside the slurry outlet, when air and slurry are supplied, the air outlet and the slurry outlet are opened, and when air and slurry are not supplied, the air outlet and the slurry outlet are automatically closed to prevent clogging and reverse flow. Air and slurry automatic opening and closing In the single-sided DCM agitator with the device installed,
The air and slurry automatic opening and closing device includes an air injection pipe connected perpendicularly to the air supply pipe and extending to the end of the discharge port;
It is inserted with an air passage inside the air injection pipe and moves forward with air pressure when air is supplied to open the air outlet, and when air is not supplied, it is retreated by the compressive force of the first spring at the inner end to block the air outlet air nozzle; and
It is slidably installed on the outer circumferential surface of the air outlet side of the air injection pipe and blocks the slurry outlet when the slurry is not supplied by the compressive force of the second spring connected to the outer surface of the air injection pipe, and when the slurry is supplied, the second Air and slurry discharge device of a large-faced DCM agitator, characterized in that it comprises a; opening and closing opening for opening the slurry discharge port while elastically springing the spring.





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